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We will be talking about what we have learnt from GC Conditional Based Maintenance. Through out these years GC has been subjected to various maintenance regime such as monthly repeatability test, Response factor control chart, ISO 10723, validation. The GC performance have been accepted to be good based on a certain tolerance.

When we go into metering field, one of the best thing i like about it is that the industry always look for better ways to improve measurement. As a result, we have various tolerance set by different parties such as manufacturers and standard organisations. Some of the conflicting standards are for instance in repeatability test where manufacturers states that their GC is capable of measuring to +/- 0.05% of CV while we have repeatability standards that assign tolerance to each individual gas where combined will have CV tolerance of +/- 0.3%. As it stand at the moment, the current limits are being used, and GC keep failing, even when tests are performed it gives good results. Despite the tolerances we still constantly finding error in the magnitude of more than 1% in CV measurement which cost in the mis-measurement of hundeds of thousands of dollars.

One of the main thing we've learnt from performing conditional based monitoring in GC is that GC is capable of performing so much better than the currently accepted tolerance. And by performing conditional based monitoring, not only we are capable of ensuring that GC measurement is accurate at all time, but also we are capable of detecting failure before the GC fails.

We will also discuss about the cost of CBM implementation. The notion about CBM is difficult and expensive maybe true to some other devices, but for GC CBM the only thing required is software without any hardware modifications as all data required for CBM is available in the GC it self. We just need to process the data correctly.

If you are around in the workshop, please look for our presentation to understand further of what can be achived when CBM is implemented as part of your GC maintenance regime.